So I've ran into this odd issue. Firstly, I ordered a ZorRAM card (128MB) and it seemed to not like my Mediator 4000Di. The tech support from Amigakit suggested I pull out the Mediator and test it without any other cards in (I am assuming they meant for me to put in my original Busboard, since... well you know I don't have any Zorro slots on the actual motherboard..., but they did not specify.)
I had an A4000D once which also had some weird behaviour. With 030 CPU, it worked just normally. With 060 CPU, after powering it up, it rebooted after less than 15 seconds, but only once and after that it worked normally, except for: No Zorro 3 cards would be working anymore.
I found no solution to this problem and so I tossed it for an A4000T after a few years not being able to use my CV64 in this machine.
Maybe you have a similarily broken machine.
PS: 20000 new posts since my last login... gosh...